Saw.



J. W. COSTELLO. SAW.

APPLICATION FILED JULY 14, 1909.

963,520. Patented uly 5, 1910.

(QM newton 2 mm Wmm.

UNITED STATES PATENT OFFICE.

JOHN w. COSTELLO, or cHAMPLA-Imimw YORK.

saw.

To all whom it may concern: 1

Be it"known that I,- JoHN-W. Cos'rELLo residing at Champlain, in the county of Clinton-and State of New York, subject of Canada, have invented a new and useful Saw, of which the following is a specification.

This invention relates to saws such as are used by butchers in cutting through bone.

One object of the invention is to provide a novel form of double bladed circular saw in which the blades shall be driven in op 0- site directions.

The invention consists in certain nov details of construction and combinations 0 parts hereinafter fully described, illustrated in the accompanying drawings,'and specifically set forth in the claims.

In the accompanying drawings, likecharacters of reference indicate like parts in the several views, and Figure 1 is a side eleva-v tion of a saw constructed in accordance with this invention. Fig. 2 is a section on the line 22 of Fig. 1. Fig. 3 is a bottom plan view 'of Fig. 1. I

i The frame or casing of the saw comprises what may be termed a main member 10 and a cover member 11. These members are connected by means of bolts or screws 12 and at one end there is attached to the two members a handle 13 of the ordinary form, the same being secured to the frame or casing by means of screws 14. The central parts of the members 10 and 11 are spaced apart to form a saw receiving recess 15 and'upon the lower edge of the member 11 is formed a bearing boss 12.

Extending outwardly from the lower part of the member 10 is a convex portion 16, the lower edge of which extends inward as at 17 to form a gear guard as will be hereinafter apparent. From the upperportion of the member 10 extends a sleeve 18.

It is to be noted that the member 10 is made in two halves for convenience in assembling the parts and that the line of separation of these halves is through the center of the sleeve 18.

On each half of the member 10 there are provided certain bosses 19 having screw receiving openings therethrough and the two halves of the member 10 are held together by means of screws 20 passing through these openings. The boss 12 has a companion boss 21 formed in the member 10 inaxial alinement with said boss 12. Each of the bosses Specification of Letters Patent.

Application filed J'uly'14; 1909. SeriaI No. 507,641.

Patented July 5, 1910.

with suitable solid bushings 22.

Supported in the bearing bosses 12 and 21 is a shaft 23 and secured upon this shaft adjacent the boss 21 is a bevel gear 24. This shaft further is provided with a collar 25 adjacent the boss 12 and running loosely on the shaft adjacent this collar is a bevel gear 26. p

Extending through the sleeve 18 is a drive shaft 27 provided with a polygonal end 28 arran ed to be enga ed by the clutch on the I end 0 a flexible sha t driven from any suitable source of power, neither the shaft nor the driving mechanism being deemed necessaryhere to be shown as the same forms no part of this invention.

U on the lower end of the shaft 27 is a 30 'whileto the gear 26, is secureda similarsawblade 31, the blades being of the same diameter buthaving the teeth in one facing in the opposite. direction to the teeth in the other.

In the operation of this invention the hand1e'13 is grasped and the flexible shaft started in any of the' ordinary manners. This causes the gears 26 and 24 to rotate in opposite directions as hereinabove described, with the result that the, saws 30 and 31ii'kewise revolve in opposite directions. It will be apparent thatwhen "the saws strike bone or the like material the action of one saw in tending to move the device in one direction will be compensated for by the action of the other saw tending to move the device in the opposite direction. There will thus be no tendency to jump, and in consequence the cutting will be more rapid and splintering eliminated.

While a specificform of casing is herein 12-and 21 and the sleeve 18 are provided frame, a shaft mounted in said frame, a gear rial principles thereof. It is not therefore desired to confine the invention to the exact form herein shown and described, but it is wished to include all such as pro erly come within the scope of the appende claims.

Having thus described the invention, what is claimed as new, is i 1. In a device of the kind described, a-

loosely mounted u on said shaft, a circular saw blade mount on said shaft, a second circular saw blade mounted on said gear, and means to revolve the gear inone direction and the shaft in the opposite direction whereby said saw blades are oppositely re-.

volved, said means comprising a second gear fixed on said shaft and in spaced relation to the first mentioned gear, both of said gears being inwardly facing bevels, a third gear meshing with the first mentioned gears, and a shaft carried in said frame securedto the third gear and provided with means for connection to the driving mechanism.

JOHN W. COSTELLO. Witnesses:

A. Cos'rELLo, SUSAN E. MEEHAN. 

